CRT based RPTV Convergence Repairs - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #51 of 305 Old 12-31-07, 09:17 PM Thread Starter
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Re: CRT based RPTV Convergence Repairs

I rarely see resistors fail along with the convergence ICs in this model. While the chip is out, look for heat stressed resistors and verify that the large ones near the output IC are not open.

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post #52 of 305 Old 12-31-07, 10:04 PM
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Re: CRT based RPTV Convergence Repairs

I'll check them out when I replace the IC.
Thank you for the Info., I do appreciate it. Soon as I get the work completed I'll let you know the results. I'll take pictures along the way.
Thank you,
Larry
PS: Is there a guide or anything which details the procedure in replacing the IC? It doesn't look like it's going to be brain surgery but I appreciate all the help I can get
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post #53 of 305 Old 12-31-07, 10:56 PM
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Re: CRT based RPTV Convergence Repairs

Hey there Sasquachh. I have the same model tv, and i just did my repair about a month ago. One advice, as you remove the harnesses one-by-one, its a good idea to number them, and then draw an approximate location on a piece of paper. I used masking tape and a sharpie. Basically, a rough layout of the location of the harnesses on the board. The harnesses are numbered, but the numbers on the board are not easily visible, and a layout on paper will help guide you when you're putting them back. Pretty much all wire-ties will have to be undone. Do not force the wires out, and always hold the connector, not the wires. When you have removed the assembly completely, be sure to carefully dust it off with some compressed air for electronics. Do this away from the tv set and preferably not inside your house. You can get a can from radio shack or a similar store. And while you're there, pick up a little tube of thermal paste. You'll need it for the new chip.

The center board will have to be removed from the frame. Be careful when you handle the board after you've unscrewed it. I used a piece of cardboard on the table, then flipped the board over and de-soldered the chip. After you have removed the chip, the resistors can be tested.

I am giving you some hints as I assume you have not done anything similar before. Pardon my ignorance if I offend you. Sorry, I did not take pictures, my camera's memory card has been acting up.

So, take your time, and good luck!
post #54 of 305 Old 12-31-07, 11:13 PM
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Re: CRT based RPTV Convergence Repairs

Kaindia,
thank you so much for taking the time to explain this. You're right, I've never done anything like this before so I do appreciate any help I can get. Being out here in snow-covered Southern Utah help is further than just down the street. If only this TV broke 6 months ago when I still lived in Irvine California, there were more than enough electricians around there, but going through this was my destiny I suppose
In any case I'll follow your advice. Thank you again and "Happy New Year".
Larry
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post #55 of 305 Old 01-01-08, 11:35 AM
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Re: CRT based RPTV Convergence Repairs

Quote:
lcaillo wrote: View Post
You could get a service manual but if you just look for the largest heat sink you can't miss the location of the IC. IIRC, your set uses a single STK393-110 rather than two ICs. Be careful to buy only from the recommended distributors.

Hi lcaillo, and thank you for the very detailed steps you have provided in attempting an IC repair.
I will be attempting to fix a convergence issue on my Mits WS65807 and was just curious if I have (2)
STK392-570 chips, or just (1), as in the above post.
Thanks, Typhus
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post #56 of 305 Old 01-02-08, 06:20 PM
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Re: CRT based RPTV Convergence Repairs

Great forum!

I have a Hitachi 53UWX10B. I was going to order the 150 IC's, but apparently the 160's run cooler? Do I need to change out any resistors from what I have now (110's that are bad), assuming they're still good if I switch to the 160's (or 150's for that matter)?

How do I find out which kit to order? I had found x480293, but I'm not sure if that comes with 160's or not. This site has a x480293 kit and it says it comes with 160's, but I don't know how to tell if they're original or not (audiolabga):

http://www.audiolabga.com/mal_cart/d...l/X480293.html

Thanks!
post #57 of 305 Old 01-02-08, 06:48 PM Thread Starter
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Re: CRT based RPTV Convergence Repairs

The kit under the part number X480293 should be a Hitachi supplied kit and if so is the correct one for your set. Just make sure that the supplier is an authorized Hitachi distributor. I don't know if Audiolab of GA is or not, but I know Tritronics, Vance Baldwin, and Andrews are.

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post #58 of 305 Old 01-02-08, 06:57 PM
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Re: CRT based RPTV Convergence Repairs

Ok, thanks. I'll find out if they are.

What about the first question in my post about the resistors?
post #59 of 305 Old 01-02-08, 07:03 PM Thread Starter
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Re: CRT based RPTV Convergence Repairs

If you have the right kit from Hitachi, I would recommend just changing all of the resistors that they have supplied for your set.

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post #60 of 305 Old 01-05-08, 12:18 PM
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Re: CRT based RPTV Convergence Repairs

I have hitachi ultravision 61UDX10B. Based on informantion provided by Icaillo, I think I have a convergence problem for blue in vedrical channel because when I try to adjust the convergence for the blue for vertical channel... it does not converge. See attached picture. Will changing IC fix this problem?

Thanks,
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CRT based RPTV Convergence Repairs-capecod-235.jpg  

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convergence , dcam , resistors , service menu , shutdown , stk , stk392-110 , stk392-120 , stk392-570 , stk394-160

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